Milling machine



May l, 1923. n 1,453,654

J. E. BERGSTROM MILLING MACHINE Filed Jan. 24, 1921 CIJ Patented Mayl 1,' i923.

JOHAN ERIK. nnnefsrncir,V or

MILLING MACHINE.

.Application led January 24, 17921. SerialNo. 439,670.

tion for patent in Norway, January 8, 192D) ,l

of which the following is a specification.

The invention relates to improvements in milling-machines` and especially machines for milling facon-pieces, facongrooves and the like.

In order that the invention may easily be understood reference` is made to the accompanying drawings in which is illustrated an embodiment of my invention, Fig. 1 showing a side view of the machine, partly in longitudinal section and Fig. 2 being a plan view of the bearing of the cutterspindle showing the different parts in another position from that shown in Fig. 1.

1 is the frame, 2 isan arm which supports the bearing sleeve of the cutter-spindle, the arm 2 being for this purpose pro` vided with a cylindrical head 3 having an axial vertical bore which is adapted to receive a supporting means 4, which is 'provided with threads 5 and 6, tov receive nuts 7 and 8. The diameter of the thread 6 is conveniently mace somewhat bigger than the diameter of the thread 5. Obviously by loosening the nut 7 and screwing the nut S in one direction or other it is possible to adjust the supporting part 4 to the desired height and keep it there by thus tightening the nut7.

In the frame 1 is a feeding'screw 9. This screw has a shoulder 10 and outside this a pivot 11, which is easily turnable in a head 12. The pivot 11 has an extension 13, at the outer end of which is a threaded portion 14 to receive a nut 15. The extension 13 serves to receive the hub 18 of a handle 16 which is used for turning the feeding screw 9 and has a lug 'or a pin 17, which enters a corresponding notch in the hub. The head 12 is by means of a pivot 19 having a threaded extension 20, which supports a nut 2Oa connected to a slide 21 which is guided in the frame 1 and serves to support .the work piece 22. The fastening of the work piece to the slide may be done by means of -a pin-screw 23. The section of the slide 21 is circular and said slide may be guided by means of a screw bolt`-24, whichmoves in a guiding groove 25 in the slide.

26 isa copying rulewhich isv guided in the frame.` -The copying rule has a slot 2? ,l Vwhich engages the headl of a pin-screw 28,

cHnIsTIANIA, NORWAY, AssIeNon fro GUs'rAr s'rAnLn, n, i or STOCKHOLM, swnnnN.

which is ifastened in the part 12. During the `feeding 'motion the pin-screw-head is in contact with the front part of the slot 2T and during the backward motion with its rear part. Hence there is obtained an especially desirable dead-Inotion between the` slide 21 and the guiding rule 26 during the motion of the slide to and from the work-` ing-position. A roll 30 bears on the guiding plane 29 ofthe 'copying rule and is mounted on an arm 31 which is guided be# tween arms 32 in the frame, contact between the roll 30 and the guiding frame29 being secured by means of a spring 33. 1

The arm 31 ends in a head 34 which receivesa bearing sleevel 35 in which thecutter-spindle is excentrically supported. On the sleeve 35 and between nuts 37' andv 38 is fastened a guiding sleeve39 adapted to l rest on the supporting part 4. The con- 35 is secured by a pin screw 40. The sleeve 35 supports the cutter-spindle and to one end of the same is fastened the pulley 41 while in the other end is fastened a lsuitable cutter 42 bearing against a shoulder 43.

The opera-tion of the machine is easily understoodi- "The working of the material takes place during the motion of the same to the left (Flg. 1) the desired angular motion being imparted by means of the groove 2.5,. The cutter will cut'into'the material before the copying rule will take effect, but as soon as the head of the screw 28V strikes the end of the slot 2'? the copying rule 26 with the guiding plane 29 will strike the roll 30 and thereby turn the bearing sleeve 35 with the guiding sleeve 39 so that the cutter spindle is lowered and a sloping surface 'or a groove is milled at a fixed constant or variable angle to the horizontal. y It will be understood that the construe v nectionbetween the head 34 and the sleeveA tion may be varied in many ways with rey bearing of the support and provided with an eccentric here, a spindle mounted in said bore and provided with driving means and also with a milling cutter, Work holder7 a. support therefor'on Which the Work holder is mounted for sliding movement7 means to actuate the Work holder, and means7 including an element having limited movement with the ivorlr holder, to partly turn the said sleeve and therebyT vertically adjust the spindle and cutter as the Work holder advances,

2. ln a mailing machine of the class described, a support, a sleeve mounted in a `hearing` of the support and provided With an eccentric bore, a spindle mounted in said bore and provided With driving means mesme and also with milling Cutter, a wei-li' holder, a supper therefor on which the vrorlr holder is mounted for sliding move nient, means to aetuate the Work holder, an element having` limited movement with the Work holder and provided with an inclined cam surface, and an arm attached to said sleeve and bearing on said cam surface, to partly turn the said sleeve and thereby vertically adjust the spindle and Cutter as the work holder advances.

ln testimony whereof aliix my signature in presence of tivo Witnesses.

JOHAN Een; BERGSTRM. lVitnesses:

S. SivENsoN,

RLIN VVAHMAN. 

